An air conditioning unit works by taking heat out of a room. As the refrigerant gas expands in the cooling coils, it absorbs heat from the circulating air in the room. This heat is then released as the refrigerant is compressed by the part of the unit that is directed out of the room. The unit serves like a heat pump for the room. Since a refrigerator works in a similar manner, can it also be used inside a room? Justify your answer

An air conditioning unit works by taking heat out of a room. As the refrigerant gas expands in the cooling coils, it absorbs heat from the circulating air in the room. This heat is then released as the refrigerant is compressed by the part of the unit that is directed out of the room. The unit serves like a heat pump for the room. Since a refrigerator works in a similar manner, can it also be used inside a room? Justify your answer

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter44: Geothermal Heat Pumps

Section: Chapter Questions

Problem 1RQ: Geothermal heat pumps, or water-source heat pumps, are classified as either _____loop or _____loop...

See similar textbooks

Similar questions

Refrigerators currently being manufactured in the United States are using______as their refrigerant.
The working temperature of a pair of heat pumps that are connected in series is between 300K and 600K degrees Celsius. When compared to the first heat pump, the efficiency of the second heat pump is three times higher. In this case, the second heat pump receives 20 kW of heat, and both the first and second heat pumps release 20 kW of heat. Calculate the input work for both heat pumps.
An air conditioning unit works by taking heat out of a room. As the refrigerant gas expands in the cooling coils, it absorbs heat from the circulating air in the room. This heat is then released as the refrigerant is compressed by the part of the unit that is directed out of the room. The unit serves like a heat pump for the room. Since a refrigerator works in a similar manner, can it also be used to maintain a cool temperature inside a room? Justify your answer.
It takes 10 kW to keep the interior of a certain house at 20 degree C when the outside temperature is 0 degree C.This heat flow is usually obtained directly by burning gas or oil. Calculate the power required if the 10 kW heat flow-were supplied by operating a reversible engine with the house as the upper reservoir and the outside surroundings as the lower reservoir, so that the power were used only to perform work needed to operate the engine.
A heat engine operates by receiving heat from a reservoir at 900 oC at a rate of 800 kJ/min and rejects heat at a rate of 560 kJ/min to the ambient air at 27 oC. The entire work output of the heat engine is used to drive a refrigerator that removes heat from the refrigerated space at -5 oC and rejects heat to the same ambient air at 27 oC.i) Sketch the schematic diagram of the engine-refrigerator system.ii) Determine the thermal efficiency of the heat engine, %.iii) Determine the maximum thermal efficiency of the engine if it operates on a reversible cycle, %.iv) Determine the maximum COP of the refrigerator if it operates on a reverse Carnot cycle.v) Determine the maximum rate of heat removal from the refrigerated space, kJ/s.vi) Determine the rate of heat rejection to the ambient air from the refrigerator,kJ/s.
A refrigerant plant works between temperature limits of – 5°C (in the evaporator) and 25°C (in the condenser). The working fluid ammonia has a dryness fraction of 0.6 at entry to the compressor. If the machine has a relative efficiency of 50%, calculate the amount of ice formed during a period of 24 hours.The ice is to be formed at 0°C from water at 20°C and 6 kg of ammonia is circulated per minute. Specific heat of water is 4.187 kJ/kg and latent heat of ice is 335 kJ/kg.
During winter, a mechanical heat pump is turned on to supply heat to a house, which is maintained at 18°C. The wall of this house is not perfectly insulated and estimated to have heat loss at a rate of 140,000 kJ/h. The house has electrical appliances that are always turn on, and generate heat at a rate of 27,000 kJ/h. Assume that the mechanical heat pump is reversible and the outdoor temperature is 2°C. List the necessary assumption, sketch the appropriate schematic to visualize the process and calculate the coefficient of performance (COP) for this mechanical heat pump.[Semasa musim sejuk, suatu
A Carnot heat engine operates between a source at 1000 K and a sink at 300 K. If the heat engine is supplied with heat at a rate of 800 kJ/min, determine the thermal efficiency.
As per the Carnot cycle efficiency, the thermal efficiency of heat engines increases with an increase in the temperature of the heat source. An inventor has proposed to use a heat pump to transfer the heat from the source to a high-temperature thermal medium before being used in the heat engine. The inventor has claimed this arrangement increases thermal efficiency. Evaluate the inventor's claim through the thermodynamic principles.
A reversibly operating heat engine operates between two reservoirs with temperatures between 600 ℃ and 40 ℃, and the heat energy supplied to the heat engine from the 600 ℃ reservoir is 2000 kJ. This heat engine operates a refrigerator that operates reversibly between two reservoirs with temperatures between 40°C and -20°C. Since the net work output of the whole system is 360 kJ; (a) Calculate the net amount of heat transferred to the refrigerator and the reservoir at 40℃. (The reservoir at 40℃ is common for both refrigerator and heat machine.) (b) What would happen if the heat engine and refrigerator were working at 40% efficiency rather than reversibly? Recalculate part (a) for this case.
The heat engine shown receives 1.2 MW heat from a high temperature source at 500 C and rejects heat to the surroundings at 25 C. The output power from the engine is 550 kW. Find1- The amount of heat dissipated to the surroundings2- The heat engine efficiency3- Compare your answers above to a Carnot heat engine operating between the same two reservoirs
A refrigerator is used to keep the cold space at 5 °C by rejecting 8 kJ/s of heat by the condenser tothe outdoor air at 25 °C. If the compressor consumes 3 kJ/s of power, determinei. the rate of heat removed from the cold space (kJ/s),ii. the COP of the refrigeratoriii. the minimum power input to the compressor for the same rate of heat removed (kJ/s), andiv. draw the schematic of the refrigerator as a reversed heat engine.